Two different lead ion positions with tetragonal and orthorhombic local
symmetry were revealed in PbZrO3 ceramics on the base of 207Pb NMR
spectra measurements at room temperature. The obtained data and their
analysis on the base of the spectra shape calculations are in agreement with
a symmetry of Pbam nonpolar group space of PbZrO3. The comparison of
observed spectra in PbTiO3 and PbZrO3 with calculated spectra allowing
for resonance frequency chemical shift and spin-spin interaction show
that the displacements of lead and oxygen ions are not random quantities in
the investigated PbZrO3 ceramic samples.